機器
arc
background
build
car
construction
craftsman
danger
door
electric
engineering
equipment
factory
fire
flash
hand
heat
hot
industrial
industry
iron
job
labor
light
man
manual
manufacture
manufacturing
mask
metal
occupation
production
protect
protection
repair
safety
skill
smoke
spark
steel
structure
technical
technology
tool
weld
welder
welding
work
worker